基于大型仿真物理模型的二类油层水聚接触带流体运动规律研究

Research on the Contact Zone between Water Flooding and Polymer Flooding in Class Ⅱ Reservoirs with Large-scale Physical Simulation Model

针对大庆油田BSX二类油层开发遇到的矿场问题,采用非均质大型仿真物理模型模拟BSX二类油层实际油层条件、井网井距、井组连通方式,进行了水聚接触带不同注入速度匹配下的驱油试验,研究了二类油层水聚接触带区域油水运动变化规律。通过试验监测的采收率、含水率、聚合物质量浓度、示踪剂质量浓度、含油饱和度变化判断油水在二类油层、水聚接触带、三次加密油层处的动态变化规律:得出二类油层水聚接触带以水驱井完善二类油层注采关系的连通方式下,水驱与聚驱最佳注入速度比在1∶1左右。

In allusion to the problems in the development of BSX ClassⅡ Reservoirs in Daqing Oilfield,a heterogeneous large physical model was used to simulate the real reservoir conditions,well pattern spacing,and the wellblock connection mode,by which an oil displacement test was performed on different injection velocities for studying the law of water/oil motion in the contact zone between water flooding and polymer flooding of the ClassⅡReservoirs.By using the oil recovery rate,water content,polymer mass concentration,tracer concentration and change of oil saturation,the dynamic change rules of oil and water in the ClassⅡ Reservoirs,the water accumulation contact zone and the tertiary infill reservoir were judged.It indicates that the optimum injection velocity between water and polymer flooding displacement is about 1:1 in the contact zone between water/polymer drive in ClassⅡ Reservoirs under the perfect connection mode of water flooding wells .